<HTML>
<BODY BGCOLOR="white">
<PRE>
<FONT color="green">001</FONT>    package org.hackystat.telemetry.analyzer.function.impl;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import org.hackystat.telemetry.analyzer.function.TelemetryFunction;<a name="line.3"></a>
<FONT color="green">004</FONT>    import org.hackystat.telemetry.analyzer.function.TelemetryFunctionException;<a name="line.4"></a>
<FONT color="green">005</FONT>    import org.hackystat.telemetry.analyzer.model.TelemetryDataModelException;<a name="line.5"></a>
<FONT color="green">006</FONT>    import org.hackystat.telemetry.analyzer.model.TelemetryDataPoint;<a name="line.6"></a>
<FONT color="green">007</FONT>    import org.hackystat.telemetry.analyzer.model.TelemetryStream;<a name="line.7"></a>
<FONT color="green">008</FONT>    import org.hackystat.telemetry.analyzer.model.TelemetryStreamCollection;<a name="line.8"></a>
<FONT color="green">009</FONT>    <a name="line.9"></a>
<FONT color="green">010</FONT>    /**<a name="line.10"></a>
<FONT color="green">011</FONT>     * Filters out telemetry streams with zero values or no value in a <a name="line.11"></a>
<FONT color="green">012</FONT>     * &lt;code&gt;TelemetryStreamCollection&lt;/code&gt; object. <a name="line.12"></a>
<FONT color="green">013</FONT>     * <a name="line.13"></a>
<FONT color="green">014</FONT>     * @author (Cedric) Qin ZHANG<a name="line.14"></a>
<FONT color="green">015</FONT>     */<a name="line.15"></a>
<FONT color="green">016</FONT>    public class FilterZeroFunction extends TelemetryFunction {<a name="line.16"></a>
<FONT color="green">017</FONT>    <a name="line.17"></a>
<FONT color="green">018</FONT>      /**<a name="line.18"></a>
<FONT color="green">019</FONT>       * Constructs this instance.<a name="line.19"></a>
<FONT color="green">020</FONT>       */<a name="line.20"></a>
<FONT color="green">021</FONT>      public FilterZeroFunction() {<a name="line.21"></a>
<FONT color="green">022</FONT>        super("FilterZero");<a name="line.22"></a>
<FONT color="green">023</FONT>      }<a name="line.23"></a>
<FONT color="green">024</FONT>      <a name="line.24"></a>
<FONT color="green">025</FONT>     /**<a name="line.25"></a>
<FONT color="green">026</FONT>      * Performs filter operation.<a name="line.26"></a>
<FONT color="green">027</FONT>      * @param parameters An array of 1 objects of &lt;code&gt;TelemetryStreamCollection&lt;/code&gt; type.<a name="line.27"></a>
<FONT color="green">028</FONT>      * @return A new &lt;code&gt;TelemetryStreamCollection&lt;/code&gt; instance after filtering.<a name="line.28"></a>
<FONT color="green">029</FONT>      * @throws TelemetryFunctionException If anything is wrong.<a name="line.29"></a>
<FONT color="green">030</FONT>      */<a name="line.30"></a>
<FONT color="green">031</FONT>      @Override<a name="line.31"></a>
<FONT color="green">032</FONT>      public Object compute(Object[] parameters) throws TelemetryFunctionException {<a name="line.32"></a>
<FONT color="green">033</FONT>        if (parameters.length != 1 || ! (parameters[0] instanceof TelemetryStreamCollection)) { //NOPMD<a name="line.33"></a>
<FONT color="green">034</FONT>          throw new TelemetryFunctionException("Telemetry function " + this.getName()<a name="line.34"></a>
<FONT color="green">035</FONT>              + " takes 1 TelemetryStreamCollection object.");<a name="line.35"></a>
<FONT color="green">036</FONT>        }<a name="line.36"></a>
<FONT color="green">037</FONT>        else {<a name="line.37"></a>
<FONT color="green">038</FONT>          try {<a name="line.38"></a>
<FONT color="green">039</FONT>            TelemetryStreamCollection source = (TelemetryStreamCollection) parameters[0];<a name="line.39"></a>
<FONT color="green">040</FONT>            TelemetryStreamCollection target = new TelemetryStreamCollection(<a name="line.40"></a>
<FONT color="green">041</FONT>                source.getName(), source.getProject(), source.getInterval());<a name="line.41"></a>
<FONT color="green">042</FONT>            for (TelemetryStream stream : source.getTelemetryStreams()) {<a name="line.42"></a>
<FONT color="green">043</FONT>              if (! this.isAllZero(stream)) {<a name="line.43"></a>
<FONT color="green">044</FONT>                target.add(stream);<a name="line.44"></a>
<FONT color="green">045</FONT>              }<a name="line.45"></a>
<FONT color="green">046</FONT>            }<a name="line.46"></a>
<FONT color="green">047</FONT>            return target;<a name="line.47"></a>
<FONT color="green">048</FONT>          }<a name="line.48"></a>
<FONT color="green">049</FONT>          catch (TelemetryDataModelException ex) {<a name="line.49"></a>
<FONT color="green">050</FONT>            throw new TelemetryFunctionException(ex);<a name="line.50"></a>
<FONT color="green">051</FONT>          }<a name="line.51"></a>
<FONT color="green">052</FONT>        }<a name="line.52"></a>
<FONT color="green">053</FONT>      }<a name="line.53"></a>
<FONT color="green">054</FONT>      <a name="line.54"></a>
<FONT color="green">055</FONT>      /**<a name="line.55"></a>
<FONT color="green">056</FONT>       * Checks whether a telemetry stream contains all zeros or no value at all.<a name="line.56"></a>
<FONT color="green">057</FONT>       * <a name="line.57"></a>
<FONT color="green">058</FONT>       * @param stream The telemetry stream to be checked.<a name="line.58"></a>
<FONT color="green">059</FONT>       * @return True if it contains all zero or no value.<a name="line.59"></a>
<FONT color="green">060</FONT>       */<a name="line.60"></a>
<FONT color="green">061</FONT>      private boolean isAllZero(TelemetryStream stream) {<a name="line.61"></a>
<FONT color="green">062</FONT>        for (TelemetryDataPoint dp : stream.getDataPoints()) {<a name="line.62"></a>
<FONT color="green">063</FONT>          Number value = dp.getValue();<a name="line.63"></a>
<FONT color="green">064</FONT>          if (value != null) {<a name="line.64"></a>
<FONT color="green">065</FONT>            if ((value instanceof Double || value instanceof Float)<a name="line.65"></a>
<FONT color="green">066</FONT>                &amp;&amp; value.doubleValue() != 0.0) {<a name="line.66"></a>
<FONT color="green">067</FONT>              return false;<a name="line.67"></a>
<FONT color="green">068</FONT>            }<a name="line.68"></a>
<FONT color="green">069</FONT>            else if (value.longValue() != 0L) {<a name="line.69"></a>
<FONT color="green">070</FONT>              return false;<a name="line.70"></a>
<FONT color="green">071</FONT>            }<a name="line.71"></a>
<FONT color="green">072</FONT>          }<a name="line.72"></a>
<FONT color="green">073</FONT>        }<a name="line.73"></a>
<FONT color="green">074</FONT>        return true;<a name="line.74"></a>
<FONT color="green">075</FONT>      }<a name="line.75"></a>
<FONT color="green">076</FONT>      <a name="line.76"></a>
<FONT color="green">077</FONT>    }<a name="line.77"></a>




























































</PRE>
</BODY>
</HTML>
